Algorithm and experimental investigation of patch nearfield acoustic holography based on wave superposition approach

Abstract

A new patch nearfield acoustic holography (PNAH) based on wave superposition approach is proposed in this paper. In the method, the sound field is extrapolated by superposing wave fields produced by a number of fictitious sources placed inside the radiator, and then the FFT is used for reconstructing the normal velocity or the field on and near the radiator. This method has higher computational accuracy and efficiency than other PNAH techniques, and is very easy for applications. In order to prove its validity, the method was used in the experiment to reconstruct the normal velocity of a clamped point-driven steel plate, and satisfactory results were obtained.